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Rina8888 [55]
2 years ago
12

Archie spent $192.00 on Betty's gifts. If he spent 24.00 on flowers and the remaining money on 2 pairs of shoes, how much did EA

CH pair of shoes cost?
Mathematics
1 answer:
Montano1993 [528]2 years ago
6 0

Answer: He spent 84 dollars on each pair of shoes.

Step-by-step explanation: 192-24=168 168÷2=84

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In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
6ft to 8yd as a fraction in simplest form
raketka [301]
Must be in the same units
6 ft/ 24 ft   (8yds x 3 = 24 ft)
\frac{6}{24} =  \frac{1}{4}

Let's use yards instead
6 ft = 2 yds
so 
2 yds/8 yds  again is 1/4
8 0
3 years ago
La suma de los cuadrados de dos enteros positivos consecutivos es 761. Cuales son los números?
PilotLPTM [1.2K]

Answer:

19 al cuadrado suma 20 al cuadrado es 761

Step-by-step explanation:

8 0
3 years ago
The length of a rectangle is 1 units more than the width. The area of the rectangle is 56 units. What is the width, in units, of
pishuonlain [190]

Answer:

7

Step-by-step explanation:

56=8*7\\8-7=1The width is smaller, so it is 7.

8 0
3 years ago
When rolling two six faced dice, what is the probability the sum equal to seven?
Liono4ka [1.6K]
What you want is P(6∩1) or P(1∩6) or P(2∩5) or P(5∩2) or P(3∩4) or P(4∩3).
The events of rolling the dice are independent (i.e. they don't affect one another) so:
E.g.
P(6∩1) = P(6) * P(1)
P(2∩5) = P(2) *  P(5)
The probability of getting a given number on a roll is 1/6 for both dice.
So:
P(6∩1) = 1/6 * 1/6 = 1/36
This is the same for any arrangement of numbers you could get from rolling two dice.
So, we can see that there are 6 arrangements of numbers that will give a sum of 7 and so that is 6 * 1/36 = 6/36 = 1/6
5 0
3 years ago
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